When manually activating a license, a customer gets an "Invalid Activation Code".
The NSI licensing webpage has multiple fields that need to be filled in before an Activation Code can be created. If any of these fields has an invalid value, it will create an invalid activation code. This includes the OM version--make sure to include the entire version of the software (i.e. 188.8.131.52 instead of just 4.0) when entering information.
Ensure that all relevant information is put into the manual activation page.
Ensure there are no extra spaces in the Hardware Code.
Ensure the full version of OM is put in the field. (i.e. 184.108.40.206 instead of just 4.0)